A news segment about the Trump administration’s immigration policy that was abruptly pulled from “60 Minutes” was mistakenly aired on a television app after the last-minute decision not to air it touched off a public debate about journalistic independence. The segment featured interviews with migrants who were sent to a notorious El Salvador prison called the Terrorism Confinement Centre, or CECOT, under US President Donald Trump’s aggressive crackdown on immigration. The story was pulled from...